Installation manual
8
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English
Seawater Pump and Plumbing
Several guidelines should be followed during the installation
of the seawater system. Since the circulation pump is
centrifugal and not self-priming, it must be mounted so that it
is always at least one foot below the water line regardless of
which tack the vessel is on. Pump may be mounted horizon-
tally or vertically, however the discharge must always be
above the inlet. Pump head should be rotated toward the
direction of water flow.
Install the seawater speed scoop
intake as far below the water line and as close to the keel
as possible in any application, but especially on a
sailboat, to keep the intake in the water when the boat
heels over so that air does not get into the system.
The
speed scoop intake must face forward and not be shared with
any other pump. A seawater strainer is mandatory between
the shut off valve (seacock) and the pump to protect the pump
from any foreign matter.
Failure to install a seawater
strainer will void the pump warranty
. The seawater system
should be installed with an upward incline from the speed
scoop & seacock, through the strainer, to the inlet of the pump
and then up to the inlet of the air conditioning unit’s condenser
coil. The discharge from the air conditioning unit should then
run to the seawater outlet thru-hull fitting which should be
located where it can be visually checked for water flow and as
close as practicable to the waterline to reduce noise. All hose
connections shall be secured by means of double/reversed
stainless steel hose clamps. Use teflon tape on all threaded
connections. The following is a summary of the seawater
system installation:
1. Install the speed scoop thru-hull inlet as close to the keel
and as far below the water line as possible, facing forward.
Bed the scoop with a marine sealant designed for
underwater use.
2. Install a bronze, full flow seacock on the speed scoop
thru-hull inlet.
3. Install a seawater strainer below the level of the pump
with access to filter.
4. Mount the pump above the strainer and at least one foot
below the waterline.
5. Connect the seacock and strainer with an uphill run of
5/8" reinforced marine grade hose.
6. Connect the discharge from the pump uphill to the bottom
inlet of the air conditioning unit’s condenser coil with
5
/
8
"
hose. Connect the discharge from the condenser coil to
the overboard discharge thru-hull fitting with
5
/
8
" hose.
7. Avoid loops, high spots or the use of 90° elbows with
seawater hose (each 90° elbow is equivalent to 2.5' of
hose and a 90° elbow on the pump outlet is equivalent to
20' of hose).
8. Double clamp all hose connections with stainless steel
clamps, reversing the clamps.
9. Use teflon tape on all threaded connections.
10.
Connect all metallic parts in contact with seawater to
the vessel’s bonding system including the speed
scoop inlet, strainer, pump and the air conditioner
.
Refer to Figure 10, 11a , and 11b at the back of this manual
for seawater kit installation.
Installation Checklist
(review prior to and after installation)
Seawater cooling system
• Speed scoop located as far below the water line and as
close to the keel as possible
• Shut off valve and speed scoop properly sealed and tight
• Seawater pump at least one foot below water line and
securely mounted
• Strainer mounted below pump with access to filter
• Double/reversed stainless steel hose clamps on all hose
connections
• Teflon tape on all threaded connections
• Hose runs uphill from speed scoop to strainer, pump and
air conditioning unit
• Water flowing freely from overboard discharge while pump
is running
Mounting
• Not in engine room or bilge areas, must be sealed away
from exhaust or fumes
• Proper spacing allowed around unit
• Attached to solid level platform with four hold down clips
provided
• Condensate drain routed aft and down hill to a sealed sump
(not bilge)
Electrical
• All butt connections on pump wire tightly crimped and heat
shrunk
• AC power source installed and grounded/bonded in
accordance with ABYC standards
• Control wires connected to terminal strip with ring terminals
Grills and Ducting
• Supply air grill mounted as high as possible
• Return air grill mounted as low and as close to the unit as
possible
• Return air grill mounted away from exhaust and bilge vapors
• Ducting is pulled taut, straight and properly connected with
no excess